Troubleshooting

Heater Does Not Operate (Pilot Ignition)

Visible pilot

Measure the flame signal when there is a visible pilot

 

 

 

 

 

Flame signal greater

No

 

 

than 1.25 VDC

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

Check for proper airflow

 

 

 

Reference: Start-Up - Direct Gas, 

 

 

 

Set the Burner Air Pressure Differential, pg. 16

 

 

 

 

 

 

 

 

 

 

 

 

 

Pressure drop across the burner

No

 

 

between 0.625 and 0.675 in. WC?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

Check the minimum firing rate

 

 

 

Reference: Start-Up - Direct Gas,

 

 

 

Set the Unit’s Operating Temperature, pg. 18

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the minimum firing rate

No

 

 

set correctly?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

Does the flame signal

No

 

 

remain constant?

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: The flame signal should be steady and above 1.25 VDC with a visible pilot.

Reference: Start-Up - Direct Gas,

Flame Signal Check - Pilot Ignition, pg. 18

Unit is not grounded.

Properly ground unit.

Flame rod is grounding out.

Adjust the flame rod to avoid contact with the burner or the unit.

Cracked porcelain on flame rod.

Replace flame rod.

Note: When the pressure is low or marginal and the unit

begins heating, the air density will change. This can cause the pressure to drop below the minimum setting. Also, low airflow can cause the flame to walk out of the burner and away from the flame sensor, causing the unit to recycle.

Adjust burner baffles

Reference: Start-Up - Direct Gas, 

Set the Burner Air Pressure Differential, pg. 16

Note: Burners greater than 36 inches in length use an interrupted pilot. The pilot is turned off 10 seconds after lighting the main burner and the flame safeguard monitors the main flame instead of the pilot flame. If the minimum fire is set too low, the flame safeguard may not be able to sense it.

Adjust the minimum firing rate.

Reference: Start-Up - Direct Gas,

Set the Unit’s Operating Temperature, pg. 18

If the signal slowly drops off, typically the airflow is too low.

Reference: Start-Up - Blowers, Set the Maximum Firing Rate

If it suddenly drops to zero, the flame rod is grounding out. Adjust the flame rod to avoid contact with the burner or the unit.

If the flame signal is above 1.25 VDC and constant, the main gas valves will remain open until the call for heat is interrupted or the unit is shut down.

28Model VSU Make-Up Air

®

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Greenheck Fan 470654 manual Visible pilot, Between 0.625 and 0.675 in. WC?
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